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        <a href="../.." >EventTarget 接口</a>
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                                <section class="normal markdown-section">
                                
                                <h1 id="eventtarget-&#x63A5;&#x53E3;">EventTarget &#x63A5;&#x53E3;</h1>
<p>&#x4E8B;&#x4EF6;&#x7684;&#x672C;&#x8D28;&#x662F;&#x7A0B;&#x5E8F;&#x5404;&#x4E2A;&#x7EC4;&#x6210;&#x90E8;&#x5206;&#x4E4B;&#x95F4;&#x7684;&#x4E00;&#x79CD;&#x901A;&#x4FE1;&#x65B9;&#x5F0F;&#xFF0C;&#x4E5F;&#x662F;&#x5F02;&#x6B65;&#x7F16;&#x7A0B;&#x7684;&#x4E00;&#x79CD;&#x5B9E;&#x73B0;&#x3002;DOM &#x652F;&#x6301;&#x5927;&#x91CF;&#x7684;&#x4E8B;&#x4EF6;&#xFF0C;&#x672C;&#x7AE0;&#x5F00;&#x59CB;&#x4ECB;&#x7ECD; DOM &#x7684;&#x4E8B;&#x4EF6;&#x7F16;&#x7A0B;&#x3002;</p>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<p>DOM &#x7684;&#x4E8B;&#x4EF6;&#x64CD;&#x4F5C;&#xFF08;&#x76D1;&#x542C;&#x548C;&#x89E6;&#x53D1;&#xFF09;&#xFF0C;&#x90FD;&#x5B9A;&#x4E49;&#x5728;<code>EventTarget</code>&#x63A5;&#x53E3;&#x3002;&#x6240;&#x6709;&#x8282;&#x70B9;&#x5BF9;&#x8C61;&#x90FD;&#x90E8;&#x7F72;&#x4E86;&#x8FD9;&#x4E2A;&#x63A5;&#x53E3;&#xFF0C;&#x5176;&#x4ED6;&#x4E00;&#x4E9B;&#x9700;&#x8981;&#x4E8B;&#x4EF6;&#x901A;&#x4FE1;&#x7684;&#x6D4F;&#x89C8;&#x5668;&#x5185;&#x7F6E;&#x5BF9;&#x8C61;&#xFF08;&#x6BD4;&#x5982;&#xFF0C;<code>XMLHttpRequest</code>&#x3001;<code>AudioNode</code>&#x3001;<code>AudioContext</code>&#xFF09;&#x4E5F;&#x90E8;&#x7F72;&#x4E86;&#x8FD9;&#x4E2A;&#x63A5;&#x53E3;&#x3002;</p>
<p>&#x8BE5;&#x63A5;&#x53E3;&#x4E3B;&#x8981;&#x63D0;&#x4F9B;&#x4E09;&#x4E2A;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;&#x3002;</p>
<ul>
<li><code>addEventListener</code>&#xFF1A;&#x7ED1;&#x5B9A;&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;</li>
<li><code>removeEventListener</code>&#xFF1A;&#x79FB;&#x9664;&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;</li>
<li><code>dispatchEvent</code>&#xFF1A;&#x89E6;&#x53D1;&#x4E8B;&#x4EF6;</li>
</ul>
<h2 id="eventtargetaddeventlistener">EventTarget.addEventListener()</h2>
<p><code>EventTarget.addEventListener()</code>&#x7528;&#x4E8E;&#x5728;&#x5F53;&#x524D;&#x8282;&#x70B9;&#x6216;&#x5BF9;&#x8C61;&#x4E0A;&#xFF0C;&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;&#x7279;&#x5B9A;&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;&#x4E00;&#x65E6;&#x8FD9;&#x4E2A;&#x4E8B;&#x4EF6;&#x53D1;&#x751F;&#xFF0C;&#x5C31;&#x4F1A;&#x6267;&#x884C;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;&#x8BE5;&#x65B9;&#x6CD5;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript">target.addEventListener(type, listener[, useCapture]);
</code></pre>
<p>&#x8BE5;&#x65B9;&#x6CD5;&#x63A5;&#x53D7;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#x3002;</p>
<ul>
<li><code>type</code>&#xFF1A;&#x4E8B;&#x4EF6;&#x540D;&#x79F0;&#xFF0C;&#x5927;&#x5C0F;&#x5199;&#x654F;&#x611F;&#x3002;</li>
<li><code>listener</code>&#xFF1A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;&#x4E8B;&#x4EF6;&#x53D1;&#x751F;&#x65F6;&#xFF0C;&#x4F1A;&#x8C03;&#x7528;&#x8BE5;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;</li>
<li><code>useCapture</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x662F;&#x5426;&#x5728;&#x6355;&#x83B7;&#x9636;&#x6BB5;&#xFF08;capture&#xFF09;&#x89E6;&#x53D1;&#xFF08;&#x53C2;&#x89C1;&#x540E;&#x6587;&#x300A;&#x4E8B;&#x4EF6;&#x7684;&#x4F20;&#x64AD;&#x300B;&#x90E8;&#x5206;&#xFF09;&#xFF0C;&#x9ED8;&#x8BA4;&#x4E3A;<code>false</code>&#xFF08;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x53EA;&#x5728;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#x88AB;&#x89E6;&#x53D1;&#xFF09;&#x3002;&#x8BE5;&#x53C2;&#x6570;&#x53EF;&#x9009;&#x3002;</li>
</ul>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">hello</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Hello world&apos;</span>);
}

<span class="hljs-keyword">var</span> button = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;btn&apos;</span>);
button.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, hello, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>button</code>&#x8282;&#x70B9;&#x7684;<code>addEventListener</code>&#x65B9;&#x6CD5;&#x7ED1;&#x5B9A;<code>click</code>&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;<code>hello</code>&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x53EA;&#x5728;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#x89E6;&#x53D1;&#x3002;</p>
<p>&#x5173;&#x4E8E;&#x53C2;&#x6570;&#xFF0C;&#x6709;&#x4E24;&#x4E2A;&#x5730;&#x65B9;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x3002;</p>
<p>&#x9996;&#x5148;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x9664;&#x4E86;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x662F;&#x4E00;&#x4E2A;&#x5177;&#x6709;<code>handleEvent</code>&#x65B9;&#x6CD5;&#x7684;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript">buttonElement.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, {
  handleEvent: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;click&apos;</span>);
  }
});
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>addEventListener</code>&#x65B9;&#x6CD5;&#x7684;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x5177;&#x6709;<code>handleEvent</code>&#x65B9;&#x6CD5;&#x7684;&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x5176;&#x6B21;&#xFF0C;&#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#x9664;&#x4E86;&#x5E03;&#x5C14;&#x503C;<code>useCapture</code>&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x662F;&#x4E00;&#x4E2A;&#x5C5E;&#x6027;&#x914D;&#x7F6E;&#x5BF9;&#x8C61;&#x3002;&#x8BE5;&#x5BF9;&#x8C61;&#x6709;&#x4EE5;&#x4E0B;&#x5C5E;&#x6027;&#x3002;</p>
<blockquote>
<ul>
<li><code>capture</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x8BE5;&#x4E8B;&#x4EF6;&#x662F;&#x5426;&#x5728;<code>&#x6355;&#x83B7;&#x9636;&#x6BB5;</code>&#x89E6;&#x53D1;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;</li>
<li><code>once</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x662F;&#x5426;&#x53EA;&#x89E6;&#x53D1;&#x4E00;&#x6B21;&#xFF0C;&#x7136;&#x540E;&#x5C31;&#x81EA;&#x52A8;&#x79FB;&#x9664;&#x3002;</li>
<li><code>passive</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x4E0D;&#x4F1A;&#x8C03;&#x7528;&#x4E8B;&#x4EF6;&#x7684;<code>preventDefault</code>&#x65B9;&#x6CD5;&#x3002;&#x5982;&#x679C;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x4E86;&#xFF0C;&#x6D4F;&#x89C8;&#x5668;&#x5C06;&#x5FFD;&#x7565;&#x8FD9;&#x4E2A;&#x8981;&#x6C42;&#xFF0C;&#x5E76;&#x5728;&#x76D1;&#x63A7;&#x53F0;&#x8F93;&#x51FA;&#x4E00;&#x884C;&#x8B66;&#x544A;&#x3002;</li>
</ul>
</blockquote>
<p>&#x5982;&#x679C;&#x5E0C;&#x671B;&#x4E8B;&#x4EF6;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x53EA;&#x6267;&#x884C;&#x4E00;&#x6B21;&#xFF0C;&#x53EF;&#x4EE5;&#x6253;&#x5F00;&#x5C5E;&#x6027;&#x914D;&#x7F6E;&#x5BF9;&#x8C61;&#x7684;<code>once</code>&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript">element.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
  <span class="hljs-comment">// &#x53EA;&#x6267;&#x884C;&#x4E00;&#x6B21;&#x7684;&#x4EE3;&#x7801;</span>
}, {once: <span class="hljs-literal">true</span>});
</code></pre>
<p><code>addEventListener</code>&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x4E3A;&#x9488;&#x5BF9;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x7684;&#x540C;&#x4E00;&#x4E2A;&#x4E8B;&#x4EF6;&#xFF0C;&#x6DFB;&#x52A0;&#x591A;&#x4E2A;&#x4E0D;&#x540C;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;&#x8FD9;&#x4E9B;&#x51FD;&#x6570;&#x6309;&#x7167;&#x6DFB;&#x52A0;&#x987A;&#x5E8F;&#x89E6;&#x53D1;&#xFF0C;&#x5373;&#x5148;&#x6DFB;&#x52A0;&#x5148;&#x89E6;&#x53D1;&#x3002;&#x5982;&#x679C;&#x4E3A;&#x540C;&#x4E00;&#x4E2A;&#x4E8B;&#x4EF6;&#x591A;&#x6B21;&#x6DFB;&#x52A0;&#x540C;&#x4E00;&#x4E2A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x53EA;&#x4F1A;&#x6267;&#x884C;&#x4E00;&#x6B21;&#xFF0C;&#x591A;&#x4F59;&#x7684;&#x6DFB;&#x52A0;&#x5C06;&#x81EA;&#x52A8;&#x88AB;&#x53BB;&#x9664;&#xFF08;&#x4E0D;&#x5FC5;&#x4F7F;&#x7528;<code>removeEventListener</code>&#x65B9;&#x6CD5;&#x624B;&#x52A8;&#x53BB;&#x9664;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">hello</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Hello world&apos;</span>);
}

<span class="hljs-built_in">document</span>.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, hello, <span class="hljs-literal">false</span>);
<span class="hljs-built_in">document</span>.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, hello, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x6267;&#x884C;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#xFF0C;&#x70B9;&#x51FB;&#x6587;&#x6863;&#x53EA;&#x4F1A;&#x8F93;&#x51FA;&#x4E00;&#x884C;<code>Hello world</code>&#x3002;</p>
<p>&#x5982;&#x679C;&#x5E0C;&#x671B;&#x5411;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x4F20;&#x9012;&#x53C2;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x7528;&#x533F;&#x540D;&#x51FD;&#x6570;&#x5305;&#x88C5;&#x4E00;&#x4E0B;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">print</span>(<span class="hljs-params">x</span>) </span>{
  <span class="hljs-built_in">console</span>.log(x);
}

<span class="hljs-keyword">var</span> el = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;div1&apos;</span>);
el.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{ print(<span class="hljs-string">&apos;Hello&apos;</span>); }, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x901A;&#x8FC7;&#x533F;&#x540D;&#x51FD;&#x6570;&#xFF0C;&#x5411;&#x76D1;&#x542C;&#x51FD;&#x6570;<code>print</code>&#x4F20;&#x9012;&#x4E86;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x3002;</p>
<p>&#x76D1;&#x542C;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;<code>this</code>&#xFF0C;&#x6307;&#x5411;&#x5F53;&#x524D;&#x4E8B;&#x4EF6;&#x6240;&#x5728;&#x7684;&#x90A3;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// HTML &#x4EE3;&#x7801;&#x5982;&#x4E0B;</span>
<span class="hljs-comment">// &lt;p id=&quot;para&quot;&gt;Hello&lt;/p&gt;</span>
<span class="hljs-keyword">var</span> para = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;para&apos;</span>);
para.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-keyword">this</span>.nodeName); <span class="hljs-comment">// &quot;P&quot;</span>
}, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;<code>this</code>&#x6307;&#x5411;&#x4E8B;&#x4EF6;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;<code>para</code>&#x3002;</p>
<h2 id="eventtargetremoveeventlistener">EventTarget.removeEventListener()</h2>
<p><code>EventTarget.removeEventListener</code>&#x65B9;&#x6CD5;&#x7528;&#x6765;&#x79FB;&#x9664;<code>addEventListener</code>&#x65B9;&#x6CD5;&#x6DFB;&#x52A0;&#x7684;&#x4E8B;&#x4EF6;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;&#x8BE5;&#x65B9;&#x6CD5;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript">div.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, listener, <span class="hljs-literal">false</span>);
div.removeEventListener(<span class="hljs-string">&apos;click&apos;</span>, listener, <span class="hljs-literal">false</span>);
</code></pre>
<p><code>removeEventListener</code>&#x65B9;&#x6CD5;&#x7684;&#x53C2;&#x6570;&#xFF0C;&#x4E0E;<code>addEventListener</code>&#x65B9;&#x6CD5;&#x5B8C;&#x5168;&#x4E00;&#x81F4;&#x3002;&#x5B83;&#x7684;&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x201C;&#x4E8B;&#x4EF6;&#x7C7B;&#x578B;&#x201D;&#xFF0C;&#x5927;&#x5C0F;&#x5199;&#x654F;&#x611F;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#xFF0C;<code>removeEventListener</code>&#x65B9;&#x6CD5;&#x79FB;&#x9664;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x5FC5;&#x987B;&#x662F;<code>addEventListener</code>&#x65B9;&#x6CD5;&#x6DFB;&#x52A0;&#x7684;&#x90A3;&#x4E2A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x800C;&#x4E14;&#x5FC5;&#x987B;&#x5728;&#x540C;&#x4E00;&#x4E2A;&#x5143;&#x7D20;&#x8282;&#x70B9;&#xFF0C;&#x5426;&#x5219;&#x65E0;&#x6548;&#x3002;</p>
<pre><code class="lang-javascript">div.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{}, <span class="hljs-literal">false</span>);
div.removeEventListener(<span class="hljs-string">&apos;click&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{}, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>removeEventListener</code>&#x65B9;&#x6CD5;&#x65E0;&#x6548;&#xFF0C;&#x56E0;&#x4E3A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x4E0D;&#x662F;&#x540C;&#x4E00;&#x4E2A;&#x533F;&#x540D;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript">element.addEventListener(<span class="hljs-string">&apos;mousedown&apos;</span>, handleMouseDown, <span class="hljs-literal">true</span>);
element.removeEventListener(<span class="hljs-string">&quot;mousedown&quot;</span>, handleMouseDown, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>removeEventListener</code>&#x65B9;&#x6CD5;&#x4E5F;&#x662F;&#x65E0;&#x6548;&#x7684;&#xFF0C;&#x56E0;&#x4E3A;&#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#x4E0D;&#x4E00;&#x6837;&#x3002;</p>
<h2 id="eventtargetdispatchevent">EventTarget.dispatchEvent()</h2>
<p><code>EventTarget.dispatchEvent</code>&#x65B9;&#x6CD5;&#x5728;&#x5F53;&#x524D;&#x8282;&#x70B9;&#x4E0A;&#x89E6;&#x53D1;&#x6307;&#x5B9A;&#x4E8B;&#x4EF6;&#xFF0C;&#x4ECE;&#x800C;&#x89E6;&#x53D1;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x7684;&#x6267;&#x884C;&#x3002;&#x8BE5;&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x53EA;&#x8981;&#x6709;&#x4E00;&#x4E2A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x4E86;<code>Event.preventDefault()</code>&#xFF0C;&#x5219;&#x8FD4;&#x56DE;&#x503C;&#x4E3A;<code>false</code>&#xFF0C;&#x5426;&#x5219;&#x4E3A;<code>true</code>&#x3002;</p>
<pre><code class="lang-javascript">target.dispatchEvent(event)
</code></pre>
<p><code>dispatchEvent</code>&#x65B9;&#x6CD5;&#x7684;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;<code>Event</code>&#x5BF9;&#x8C61;&#x7684;&#x5B9E;&#x4F8B;&#xFF08;&#x8BE6;&#x89C1;&#x300A;Event &#x5BF9;&#x8C61;&#x300B;&#x7AE0;&#x8282;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript">para.addEventListener(<span class="hljs-string">&apos;click&apos;</span>, hello, <span class="hljs-literal">false</span>);
<span class="hljs-keyword">var</span> event = <span class="hljs-keyword">new</span> Event(<span class="hljs-string">&apos;click&apos;</span>);
para.dispatchEvent(event);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5728;&#x5F53;&#x524D;&#x8282;&#x70B9;&#x89E6;&#x53D1;&#x4E86;<code>click</code>&#x4E8B;&#x4EF6;&#x3002;</p>
<p>&#x5982;&#x679C;<code>dispatchEvent</code>&#x65B9;&#x6CD5;&#x7684;&#x53C2;&#x6570;&#x4E3A;&#x7A7A;&#xFF0C;&#x6216;&#x8005;&#x4E0D;&#x662F;&#x4E00;&#x4E2A;&#x6709;&#x6548;&#x7684;&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#xFF0C;&#x5C06;&#x62A5;&#x9519;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x4EE3;&#x7801;&#x6839;&#x636E;<code>dispatchEvent</code>&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x5224;&#x65AD;&#x4E8B;&#x4EF6;&#x662F;&#x5426;&#x88AB;&#x53D6;&#x6D88;&#x4E86;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> canceled = !cb.dispatchEvent(event);
<span class="hljs-keyword">if</span> (canceled) {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x4E8B;&#x4EF6;&#x53D6;&#x6D88;&apos;</span>);
} <span class="hljs-keyword">else</span> {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x4E8B;&#x4EF6;&#x672A;&#x53D6;&#x6D88;&apos;</span>);
}
</code></pre>




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